Electrical push and switch.



"No. 704,322. Patented July 8, I902.

' E. G. HABBUURT &. M. B. LLOYD.

ELECTRICAL PUSH AND SWITCH.

(Application filed July 9. 1901.) (No Model.)

F101 i705. Fla. 2.

UNTTnn STATns PATENT OFFICE.

EDGAR GODIVIN HAROOURT, OF BIRMINGHAM, ENGLAND, AND MARSHALL BURNSLLOYD, OF MINNEAPOLIS, MINNESOTA;

ELECTRICAL PUSH AND SWITCH.

SPECIFICATION forming part of Letters Patent No. 704,322, dated July 8,1902.

Application filed July 9, 1901. Serial No. 67,691. (No model.)

To (pH/whom it may concern.-

Be it known that we, EDGAR GODWIN HAR- COURT, manufacturer, a subject ofthe King of Great Britain, of Atlas Brass Foundry,

Moseley street, Birmingham, in the countyof Warwick, England, andMARsHALL BURNS LLOYD, manufacturer, a citizen of the United States ofAmerica, of The Lloyd Manufacturing Company, Minneapolis, Minnesota,have invented certain new and useful Improvements in and Connected withElectrical Pushes and Switches, of which the following is aspecification.

Our invention has for its object improvements in and connected withelectrical pushes and switches, and refers particularly to theattachment of the dome or cover to the base or ring, by which we obviatethe necessity for forming a screw-joint, which has hitherto been thecustomary means used for connecting these two parts together, andsubstitue at spring-clip, by which means the dome is not liable tobecome detached from the ring when turned around, as is the case withthe screw ones, while the cost of manufacture is reduced.

In order that our invention may be clearly understood and more easilycarried into practice, we have appended two sheetsof drawings, uponwhich we have fully illustrated our improvements.

Figure l is a front elevation of the base or ring and insulator with thedome removed. Fig. 2 is a side elevation of the dome. Fig.

3 is a section through the dome. Fig. 4 is a side elevation of the baseor ring. Fig. 5 is a top edge view of the ring shown in Fig. 1.

Fig. 6 is a similar view to Fig. 1, butshowing a modified form ofspring-catch.

B designates the base, provided with a circular flange B on its upperface, and D is the insulator in the bottom of the recess formed by saidflange and to which insulator the usual contacts are secured, as shownin Fig. 1. A A designate two semicircular springs resting looselyagainst the inner side of the flange B at opposite sides thereof andhaving their ends a a bent outwardly and extended through the slots orapertures 1) b formed in the flange B. The ends a a beyond the flange Bare provided with an upper inclined edge a and so the inclined ends formcatches.

E designates the dome, having the usual central opening for thepush-button and provided on its inner side, near its lower edge, with anannular groove 6, and the lower edge of the dome is further providedwith a recess 6 which intersects the groove 0 and is of a lengthslightly greater than the distance between the two catches a a It willbe seen that by placing the dome E over the flange B and pressing itdownwardly its lower edge will force the catches a a inwardly until thegroove e registers therewith, whereupon the catches will enter thegroove and. hold the dome to the base. By now turning the dome till itsrecess 6 comes over two of the catches a a it may be readily lifted andremoved. Obviously one spring only may be employed.

If desired, we may rivet a single spring A to the inner wall of theflange B, (see Fig. 6,) with its catch end a projecting through anaperture Z) in said flange, and directly opposite the aperture weprovide the flange on its outer side with a lug a This is preferablydone by punching it out of the body of the flange. The dome E may beapplied to and removed from the base just as in Figs. 1 to 4.

What we claim is- 1. In a push-button, the combination with the baseprovided with an apertured flange on its upper side, and a spring-catchprojecting through the flange-aperture, of a dome to pass over the saidflange and having a groove on its inner side to engage the catch and arecess in its lower edge intersecting the groove; substantially asdescribed.

2. In a push-button, the combination with 0 the base provided with araised apertured flange, and a curved spring within the flange andhaving its ends bent outwardly through the flange-aperture toformspring-catches, and the dome having an internal annular groove to engagethe catches and a recess in its lower edge intersecting said annulargroove; substantially as described.

3. In a push-button, the combination with the base provided with araised annular Ioo flange having opposite pairs of apertures, and twoopposed curved springs resting In witness whereof we have set our handsin the presence of two subscribing witnesses.

EDGAR GODWIN HARCOURT.

against the inner wall of the said flange with their ends projectingthrough the apertures therein and formed as catches, of a dome fittingover the said flange and provided with an I MARSHALL BURNS LLOYD.internal annular groove receiving said catches itnesses:

and a recess in its lower edge intersecting l LEWIS W. GOOLD, saidgroove; substantially as described.

\VALTER H. E. BARTLAM.

